Stove Pipe installation thread

Hey All.

I am trying to figure out the best way to install our stove pipe. There is a fireplace hearth, but the chimney no longer extends all of the way out of the roof. The previous owners took the chimney down below the roofline and roofed over it, since the fireplace wasn't being used.

I've attached a picture of what it looks like in my attic. The plan is to run the flexible stovepipe down to the stove, but I need to figure out how to attach it and send it through the roof safely. My original thought was to take a little more of the chimney down for a little more clearance, then connect the flex pipe to some triple wall and run that through the roof. The concern is stability though. Do I need to do a cathedral ceiling box through the roof? Or would using those stove pipe braces on the work? What about safety? from what I have read, triple just needs 2 inches of clearance, right? If I brought the triple wall down low enough that the connection to the flex pipe is at least 2 feet from the roof, I should be fine right?

Sorry for the MS paint diagrams

 

Good question paintblljnkie......

 

You will need a Transition Plate, to mount onto the brick chimney. These components will all be under "Class A double wall Insulated pipe" What ever brand you go with, you need to stay with that brand. The Stainless Flex liner will connect to the bottom of the Transition Plate, and the Double wall insulated connects to the top of the plate. Then continue up with this pipe, through the roof, at least 3' maybe more per the 10-3-2 rule. Then a Flashing on the roof, Storm Collar and Rain Cap. There are pipe supports if you need them, and wall standoffs also.
Rock-Vent Transition Plate

 

Boom! That looks like the simplest solution of them all really.

I will have to find out what brand the triple wall I already have is. I was going to my local Feldman's (a farm store) and buying the flex from them but now I am not sure if that will work if they have to be the same brand. They carry DuraFlex. Doesn't seem like DuraFlex has the same kind of transition plate that you linked either.

 

Hold on Boss, not so quick, didn't know you were working with Air Cooled pipe! That pipe cannot be closed off, you need to maintain the cooling air around that pipe. Therefore, you cannot use the transition plate, or really anything. If this is older Air Cooled pipe, it is probably discontinued and no longer available. If it is newer Air cooled pipe like Dura Vent air cooled then you could add to it. You may not be able to extend it after all...sorry

 

Okay, now I am confused. Air cooled pipe = double or triple wall pipe? I haven't heard that term before.

 

Oi, I think I might see where the confusion came from? Just FYI, those pictures I drew - that is the INSIDE of the attic. Not the chimney extending above the roof. If that makes sense?

 

You very well could have double or triple wall pipe, better make sure...double wall is what you want for a wood burner...triple is legal, but more expensive and doesn't draft as well, or stay as clean. (oh, and air cooled = triple wall) IIRC, 6" double wall pipe (class A) is 8" OD, but triple wall is 10" OD

 

You mentioned Triple Wall Pipe, that is an Air Cooled style of pipe, and I was figuring that you had a Brick chimney with a Flex liner. And if you had Brick chimney and Flex Liner, then you could do the Transition plate and Double wall Insulated pipe.
But having Triple wall air cooled pipe, you are kinda out of luck, unless it is newer Triple wall and it is still available???

 

There is Double wall Insulated pipe, for instance a 6" Insulated pipe is 8" on the outside with insulation between the pipes 8" would be 10" on the outside. This pipe is good for outside or in the attic...

Air Cooled pipe will have an inner pipe, say 6" then an air gap then another pipe, (Double wall air cooled) some times even a third pipe - Triple wall air Cooled.
There is air that circulates to keep the inner exhaust pipe cooled.

Then you have single wall or double wall stove pipe for inside the house.

Now is everyone as confused as I am

 

Ah, didn't know about double wall air cooled...is that used on wood stoves sometimes too? Seems like maybe it wouldn't meet the temp requirements...

 

Air Cooled pipe for stoves and fireplaces has been around for a long time, but has been discontinued, although there are a few New version of them still available, but will not fit the old system. The Class A pipe is a Double wall Insulated pipe. The outside dimensions are about 2" larger than the inner pipe dimension. This pipe will allow you to be within 2" of combustible materials , and is required when going through a wall. ceiling, attic, roof, or along the outside of a house.

Class A Double Wall insulated pipes are more efficient than Air Cooled pipes.....and more expen$ive

 

I will have to look at the stove pipe again and make sure. I was pretty certain it said it was triple wall.

I do have a brick chimney, but it doesn't extend outside of the attic. Previous owners knocked the chimney down to below roof level, and roofed over it. I assume it was because they were no longer using it. So while I can run flex down the part of the chimney that is left, I still will have to go through the roof with stovepipe as well. Which is where my conundrum is. The chimney brick ends in the attic, just below the roof.

 

If you have the Brick Chimney, and no Air cooled pipes, then we are back to my first response with the Transition Plate, by code it will tell you that a stainless liner is also required.
Not sure if I have ever heard of Air Cooled Pipe inside a Brick Chimney, but anything is possible, they could be removed, then the transition plate system would work.

 

There is no air-cooled pipe inside the chimney. We are putting the stainless liner in the chimney. My problem is the transition from the liner to whatever pipe that goes through the roof since the brick ends before it gets to the roof. My idea was to connect the SS liner to the air-cooled pipe where the chimney ends, and send the air-cooled pipe through the roof. I am just not sure if that is possible, how to secure it, and what I would need to make that transition.

Is triple wall not sold anymore? I swear I have seen it in the local farm stores still.

 

Remove the old chimney.
Start over.

 

There are some Air Cooled pipe still being sold, not sure how you can do the transition with them, I think it is double wall air cooled, Dura vent

 

From the stainless liner, use the transition plate that double-d linked to above, then go the rest of the way up with class A double wall (insulated, not the air cooled stuff)
Just FYI, Menards has really good prices on Supervent class A pipe...but then I'm not sure they make a transition plate for it, so this may be a non-starter...

 

Can I go through my roof with the Class A Double wall stovepipe? I thought the clearance on that was supposed to be 6 inches. That's a fairly large hole in my roof. From install videos that I have been watching, it seems like they only have 2in of clearance, which I thought meant that they were using triple wall.

Sorry if it seems like I am asking the same question over and over. Just trying to learn and make sure I don't burn my house down

 

You're getting the terminology mixed up. Double-walled stove pipe (interior) has a 6 inch clearance to combustible requirement, Class A double-walled chimney (exterior, or attic) has a 2 inch clearance to combustibles.